Manufacture of steel sheets



V. B. BROWNE.

MANUFACTURE OF STEEL SHEETS.

APPLICATION HLED JUNE 9.1919.

1,340,149, Patehted May 18, 1920.

WITNESSES IN VENTOR $26WM M xfiti VERE B. BROWN E, OF TARENTUM,PENNSYLVANIA.

MANUFACTURE OF STEEL SHEETS.

Specification of Letters Patent.

Patented May 18, 1920.

Application filed June 9, 1919. Serial No. 302,913.

To all whom it may concern:

Be it known that I, Vans B. linowxn, a citizen of the United States, anda resident of 'larentum, in the county of Allegheny and State ofPennsylvania, have made a new and useful Invention in the Manufacture ofSteel Sheets, of which the following is a specification.

This invention relates to the manufacture of steel sheets of extremethinness.

For a number of years attempts have been made by hot rolling methods tomanufacture steel sheets of extreme thinness, that is sheets of 2/ 1000of an inch and less. In certain of the arts there is a growin demand forsuch steel sheets and so far as know no one, in this country .at least,has been able to produce the same commercially.

In certain branches of the electrical art there is a demand for suchsheets made from silicon steel and there is also a demand for sheetsmade from mild steel.

An object of this invention is to provide a method whereby steel of anydesired analysis may be commercially rolled into sheets of 2/1000 of aninch and less in thickness.

This, as Well as other objects which will readily appear to thoseskilled in the art of making steel sheets, I attain in the methodhereinafter set forth.

In rolling these extremely thin sheets under standard sheet or tin millpractice to less than 6/1000 of an inch in thickness it is impossible toseparate the sheets without tearing them.

The drawing is a sectional elevation showing a pack formed according toa preferred form of my method.

My method consists in utilizing any standard sheet or tin mill practiceto produce sheets of the desired analysis and approximately 6/1000 of aninch in thickness. Such sheets are then taken separately and placedbetween relatively heavy sheets of steel of different generalcharacteristics: that is a pack of any desired number of sheets is builtup of sheets of the special steel alternating with relatively heavysheets of steel having different eneral characteristics and the built-uppac is then rolled to length thus reducingthe special or inner sheets tothe desired thinness.

I have found that a desirable method is to bring the relatively heavysheets to rolling temperature and to alternate these with sheets of thespecial steel in a cold state. The special steel sheets take upsuflicient heat from the relatively heavy hot sheets for rolling. Ifdesired this built-up pack may consist of but three sheets, onerelatively thin sheet in a cold state of the special steel sandwichedbetween two relatively thick sheets of dissimilar steel which have beenbrought to rolling temperature. Instead of placing the special steelsheets in a cold state between relatively heavy sheets brought torolling temperature the pack which may consist of any suitable number ofsheets may be built-up and then brought to rolling temperature(preferably a low rolling temperature). These built-up packs may beworked under any of the standard mill methods and if desired may bedoubled or otherwise manifolded according to any of the approvedmethods. If doubled the pack after being-rolled to length will besheared and opened in the usual way.

On account of having the special sheets arranged alternately withheavier sheets of dissimilar steel the separation of the finished sheetsis readily affected since the dissimilar sheets under the rolling willnot weld with the special sheets, neither will the surface tension orother forces tending to hold the sheets together be great enough tocause the sheets to tear during separation.

If the special sheets are silicon steel the sheets with which theyalternate may be mild steel and if the special sheets are mild steel thesheets with which they alternate may be silicon steel. It is alwaysnecessary to see that the sheets on the outside of the pack are therelatively heavy sheets.

Having thus described my invention What I claim is- 1. The method ofrolling extremely thin sheets of steel, which consists in producing arelatively thin sheet, in sandwiching said sheet between sheets of steelof heavier gage and different general characteristics and then in hotrolling the sandwiched sheets to such length as to give the desiredthickness to the inner sheet.

2. The method of rolling extremely thin sheets of silicon steel, whichconsists in producing a relatively thin sheet, in sandwiching said sheetbetween two sheets of steel of heavier gage and different generalcharacteristics and then in hot rolling the sandwiched sheets to suchlength as to give the desired thickness to the inner sheet.

3. The method of rolling an extremely thin sheet of metal, whichconsists in placing a relatively thin sheet of such metal in a coldstate between two heavier sheets of metal having dissimilarcharacteristics and brought to a rolling temperature and then inreducing the gage of the three-ply pack.

4. The method of rolling sheets of steel of 2/1000 of an inch or less inthickness, which consists in producing a sheet no thicker than 14/1000of an inch, in sandwiching said sheet between two sheets of steel ofheavier gage and then in hot rolling the sandwiched sheets to suchlength as will give the desired thickness to the inner sheet.

5. The method of rolling sheets of steel of 2/1000 of an inch or less inthickness, which consists in producing a sheet no thicker than 14/1000of an 1I1Cl1, in sandwiching said sheet while cold between two hotsheets of steel of heavier gage and having different characteristicstherefrom and then in reducing the sandwiched sheets to such length aswill give the desired thickness to the inner sheet.

6. The method of rolling extremely thin sheets of silicon steel, whichconsists in producing a relatively thin sheet, in sandwiching said sheetwhile cold between two heated sheets of steel having differentcharacteristics and of heavier gage and then in rolling the sandwichedsheets to such length as to give the desired thickness to the innersheet.

7. The method of rolling extremely thin sheets of steel, which consistsin alternating cold relatively thin sheets with heavier sheets of steelof different characteristics raised to rolling temperature, and then inrolling the multi-ply pack to produce sheets of the desired gage.

8. The method of rolling extremely thin sheets of steel, which consistsin alternating cold relatively thin sheets with heavier sheets ofdissimilar steel raised to rolling temperature, and then in rolling theniulti-ply pack to produce sheets of the desired gage.

9. The method of rolling an extremely thin sheet of metal, whichconsists in placing a relatively thin sheet of such metal in a coldstate between two heavier sheets of other metal in a heated state andthen in reducing the gage of the three-ply pack.

10. The method of rolling an extremely thin sheet of metal, whichconsists in placing a relatively thin sheet of such metal in a coldstate between two heavier sheets of metal having dissimilarcharacteristics and in a heated state and then in reducing the gage ofthe three-ply pack.

11. The method of rolling sheets of steel of 2/1000 of an inch or lessin thickness, which consists in producing a sheet no thicker than14/1000 of an inch, in sandwiching said sheet while cold between twoheated sheets of steel having different characteristics and of heaviergage then in rolling the sandwiched sheets to such length as will givethe desired thickness to the inner sheet.

12. The method of hot rolling a sheet of metal of less than 6/ 1000 ofan inch in thickness, which consists in producing a relatively thinsheet, placing said sheet between two materially heavier sheets of metalhaving dissimilar characteristics and then in reducing the gage of themultiple pack by hot rolling, substantially as described. 13. The methodof hot rolling a sheet of steel to 3/1000 of an inch or less inthickness, which consists in producing a relatively thin sheet, placingsaid sheet between two metal sheets of materially heavier gage anddifferent characteristics raised to rolling temperature and then in hotrolling the multiple pack, substantially as described.

14. A hot rolled sheet of silicon steel under 6/1000 of an inch inthickness.

15. A hot rolled sheet of silicon steel 3/ 1000 of an inch or less inthickness.

16. A hot rolled sheet of steel less than 6/1000 of an inch inthickness.

17. A hot rolled sheet of steel 3/1000 of an inch or less in thickness.

18. A rolled sheet of silicon steel 2/1000 of an inch or less inthickness.

In witness whereof, I have hereunto subscribed my name this 5th day ofJune, 1919.

VERE B. BROVVNE.

